<template>
  <div :class="wrapClasses">
    <template v-if="type !== 'textarea'">
      <div :class="[prefixCls + '-group-prepend']" v-if="prepend" v-show="slotReady"><slot name="prepend"></slot></div>
      <i
        class="ivu-icon"
        :class="[
          'ivu-icon-ios-close-circle',
          prefixCls + '-icon',
          prefixCls + '-icon-clear',
          prefixCls + '-icon-normal',
        ]"
        v-if="clearable && currentValue && !itemDisabled && !readonly"
        @click="handleClear"
        :style="clearableStyles"
      ></i>
      <i
        class="ivu-icon"
        :class="['ivu-icon-' + icon, prefixCls + '-icon', prefixCls + '-icon-normal']"
        v-else-if="icon"
        @click="handleIconClick"
      ></i>
      <i
        class="ivu-icon ivu-icon-ios-search"
        :class="[prefixCls + '-icon', prefixCls + '-icon-normal', prefixCls + '-search-icon']"
        v-else-if="search && enterButton === false"
        @click="handleSearch"
      ></i>
      <span class="ivu-input-suffix" v-else-if="showSuffix"
        ><slot name="suffix"><i class="ivu-icon" :class="['ivu-icon-' + suffix]" v-if="suffix"></i></slot
      ></span>
      <span class="ivu-input-word-count" v-else-if="showWordLimit">{{ textLength }}/{{ upperLimit }}</span>
      <span class="ivu-input-suffix" v-else-if="password" @click="handleToggleShowPassword">
        <i class="ivu-icon ivu-icon-ios-eye-outline" v-if="showPassword"></i>
        <i class="ivu-icon ivu-icon-ios-eye-off-outline" v-else></i>
      </span>
      <transition name="fade">
        <i
          class="ivu-icon ivu-icon-ios-loading ivu-load-loop"
          :class="[prefixCls + '-icon', prefixCls + '-icon-validate']"
          v-if="!icon"
        ></i>
      </transition>
      <input
        :id="elementId"
        :autocomplete="autocomplete"
        :spellcheck="spellcheck"
        ref="input"
        :type="currentType"
        :class="inputClasses"
        :placeholder="placeholder"
        :disabled="itemDisabled"
        :maxlength="maxlength"
        :readonly="readonly"
        :name="name"
        :value="currentValue"
        :number="number"
        :autofocus="autofocus"
        @keyup.enter="handleEnter"
        @keyup="handleKeyup"
        @keypress="handleKeypress"
        @keydown="handleKeydown"
        @focus="handleFocus"
        @blur="handleBlur"
        @compositionstart="handleComposition"
        @compositionupdate="handleComposition"
        @compositionend="handleComposition"
        @input="handleInput"
        @change="handleChange"
      />
      <div :class="[prefixCls + '-group-append']" v-if="append" v-show="slotReady"><slot name="append"></slot></div>
      <div
        :class="[prefixCls + '-group-append', prefixCls + '-search']"
        v-else-if="search && enterButton"
        @click="handleSearch"
      >
        <i class="ivu-icon ivu-icon-ios-search" v-if="enterButton === true"></i>
        <template v-else>{{ enterButton }}</template>
      </div>
      <span class="ivu-input-prefix" v-else-if="showPrefix"
        ><slot name="prefix"><i class="ivu-icon" :class="['ivu-icon-' + prefix]" v-if="prefix"></i></slot
      ></span>
    </template>
    <template v-else>
      <textarea
        :id="elementId"
        :wrap="wrap"
        :autocomplete="autocomplete"
        :spellcheck="spellcheck"
        ref="textarea"
        :class="textareaClasses"
        :style="textareaStyles"
        :placeholder="placeholder"
        :disabled="itemDisabled"
        :rows="rows"
        :maxlength="maxlength"
        :readonly="readonly"
        :name="name"
        :value="currentValue"
        :autofocus="autofocus"
        @keyup.enter="handleEnter"
        @keyup="handleKeyup"
        @keypress="handleKeypress"
        @keydown="handleKeydown"
        @focus="handleFocus"
        @blur="handleBlur"
        @compositionstart="handleComposition"
        @compositionupdate="handleComposition"
        @compositionend="handleComposition"
        @input="handleInput"
      >
      </textarea>
      <span class="ivu-input-word-count" v-if="showWordLimit">{{ textLength }}/{{ upperLimit }}</span>
    </template>
  </div>
</template>
<script>
import { getCurrentInstance, nextTick } from 'vue';
import { oneOf, findComponentUpward } from '../../utils/assist';
import calcTextareaHeight from '../../utils/calcTextareaHeight';
import mixinsForm from '../../mixins/form';

const prefixCls = 'ivu-input';

export default {
  name: 'Input',
  mixins: [mixinsForm],
  emits: [
    'on-enter',
    'on-search',
    'on-keydown',
    'on-keypress',
    'on-keyup',
    'on-click',
    'on-focus',
    'on-blur',
    'on-change',
    'on-input-change',
    'on-clear',
    'update:modelValue',
  ],
  props: {
    type: {
      validator(value) {
        return oneOf(value, ['text', 'textarea', 'password', 'url', 'email', 'date', 'number', 'tel']);
      },
      default: 'text',
    },
    modelValue: {
      type: [String, Number, Array],
      default: '',
    },
    size: {
      validator(value) {
        return oneOf(value, ['small', 'large', 'default']);
      },
      default() {
        const global = getCurrentInstance().appContext.config.globalProperties;
        return !global.$VIEWUI || global.$VIEWUI.size === '' ? 'default' : global.$VIEWUI.size;
      },
    },
    placeholder: {
      type: String,
      default: '',
    },
    maxlength: {
      type: [String, Number],
    },
    disabled: {
      type: Boolean,
      default: false,
    },
    icon: String,
    autosize: {
      type: [Boolean, Object],
      default: false,
    },
    rows: {
      type: Number,
      default: 2,
    },
    readonly: {
      type: Boolean,
      default: false,
    },
    editable: {
      type: Boolean,
      default: false,
    },
    update: {
      type: Boolean,
      default: false,
    },
    name: {
      type: String,
    },
    number: {
      type: Boolean,
      default: false,
    },
    autofocus: {
      type: Boolean,
      default: false,
    },
    spellcheck: {
      type: Boolean,
      default: false,
    },
    autocomplete: {
      type: String,
      default: 'off',
    },
    clearable: {
      type: Boolean,
      default: false,
    },
    elementId: {
      type: String,
    },
    wrap: {
      validator(value) {
        return oneOf(value, ['hard', 'soft']);
      },
      default: 'soft',
    },
    prefix: {
      type: String,
      default: '',
    },
    suffix: {
      type: String,
      default: '',
    },
    search: {
      type: Boolean,
      default: false,
    },
    enterButton: {
      type: [Boolean, String],
      default: false,
    },
    // 4.0.0
    showWordLimit: {
      type: Boolean,
      default: false,
    },
    // 4.0.0
    password: {
      type: Boolean,
      default: false,
    },
    // 4.5.0
    border: {
      type: Boolean,
      default: true,
    },
  },
  data() {
    return {
      currentValue: this.modelValue,
      prefixCls: prefixCls,
      slotReady: false,
      textareaStyles: {},
      isOnComposition: false,
      showPassword: false,
      clearableIconOffset: 0,
    };
  },
  computed: {
    currentType() {
      let type = this.type;
      if (type === 'password' && this.password && this.showPassword) type = 'text';
      return type;
    },
    prepend() {
      let state = false;
      if (this.type !== 'textarea') state = this.$slots.prepend !== undefined;
      return state;
    },
    append() {
      let state = false;
      if (this.type !== 'textarea') state = this.$slots.append !== undefined;
      return state;
    },
    showPrefix() {
      let state = false;
      if (this.type !== 'textarea') state = this.prefix !== '' || this.$slots.prefix !== undefined;
      return state;
    },
    showSuffix() {
      let state = false;
      if (this.type !== 'textarea') state = this.suffix !== '' || this.$slots.suffix !== undefined;
      return state;
    },
    wrapClasses() {
      return [
        `${prefixCls}-wrapper`,
        {
          [`${prefixCls}-wrapper-${this.size}`]: !!this.size,
          [`${prefixCls}-type-${this.type}`]: this.type,
          [`${prefixCls}-group`]: this.prepend || this.append || (this.search && this.enterButton),
          [`${prefixCls}-group-${this.size}`]:
            (this.prepend || this.append || (this.search && this.enterButton)) && !!this.size,
          [`${prefixCls}-group-with-prepend`]: this.prepend,
          [`${prefixCls}-group-with-append`]: this.append || (this.search && this.enterButton),
          [`${prefixCls}-hide-icon`]: this.append, // #554
          [`${prefixCls}-with-search`]: this.search && this.enterButton,
          [`${prefixCls}-wrapper-disabled`]: this.itemDisabled, // #685
          [`${prefixCls}-wrapper-update`]: this.update,
          [`${prefixCls}-wrapper-editable`]: !this.editable,
          [`${prefixCls}-wrapper-readonly`]: this.readonly,
        },
      ];
    },
    inputClasses() {
      return [
        `${prefixCls}`,
        {
          [`${prefixCls}-${this.size}`]: !!this.size,
          [`${prefixCls}-disabled`]: this.itemDisabled,
          [`${prefixCls}-no-border`]: !this.border,
          [`${prefixCls}-with-prefix`]: this.showPrefix,
          [`${prefixCls}-with-suffix`]: this.showSuffix || (this.search && this.enterButton === false),
        },
      ];
    },
    textareaClasses() {
      return [
        `${prefixCls}`,
        {
          [`${prefixCls}-disabled`]: this.itemDisabled,
          [`${prefixCls}-no-border`]: !this.border,
        },
      ];
    },
    upperLimit() {
      return this.maxlength;
    },
    textLength() {
      if (typeof this.modelValue === 'number') {
        return String(this.modelValue).length;
      }

      return (this.modelValue || '').length;
    },
    clearableStyles() {
      const style = {};
      let offset = this.clearableIconOffset;
      if (offset) style.transform = `translateX(-${offset}px)`;
      return style;
    },
  },
  methods: {
    handleEnter(event) {
      this.$emit('on-enter', event);
      if (this.search) this.$emit('on-search', this.currentValue);
    },
    handleKeydown(event) {
      this.$emit('on-keydown', event);
    },
    handleKeypress(event) {
      this.$emit('on-keypress', event);
    },
    handleKeyup(event) {
      this.$emit('on-keyup', event);
    },
    handleIconClick(event) {
      this.$emit('on-click', event);
    },
    handleFocus(event) {
      this.$emit('on-focus', event);
    },
    handleBlur(event) {
      this.$emit('on-blur', event);
      if (!findComponentUpward(this, ['DatePicker', 'TimePicker', 'Cascader', 'Search'])) {
        this.handleFormItemChange('blur', this.currentValue);
      }
    },
    handleComposition(event) {
      if (event.type === 'compositionstart') {
        this.isOnComposition = true;
      }
      if (event.type === 'compositionend') {
        this.isOnComposition = false;
        this.handleInput(event);
      }
    },
    handleInput(event) {
      if (this.isOnComposition) return;

      if(this.type === 'number' && event.target.value.length > this.maxlength){
        event.target.value = event.target.value.slice(0,this.maxlength);
      }

      let value = event.target.value;
      if (this.number && value !== '') value = Number.isNaN(Number(value)) ? value : Number(value);
      this.$emit('update:modelValue', value);
      this.setCurrentValue(value);
      this.$emit('on-change', event);
    },
    handleChange(event) {
      this.$emit('on-input-change', event);
    },
    setCurrentValue(value) {
      if (value === this.currentValue) return;
      nextTick(() => {
        this.resizeTextarea();
      });
      this.currentValue = value;
      if (!findComponentUpward(this, ['DatePicker', 'TimePicker', 'Cascader', 'Search'])) {
        this.handleFormItemChange('change', value);
      }
    },
    resizeTextarea() {
      const autosize = this.autosize;
      if (!autosize || this.type !== 'textarea') {
        return false;
      }

      const minRows = autosize.minRows;
      const maxRows = autosize.maxRows;

      this.textareaStyles = calcTextareaHeight(this.$refs.textarea, minRows, maxRows);
    },
    focus(option) {
      const $el = this.type === 'textarea' ? this.$refs.textarea : this.$refs.input;
      $el.focus(option);
      // Selection content
      const { cursor } = option || {};
      if (cursor) {
        const len = $el.value.length;

        switch (cursor) {
          case 'start':
            $el.setSelectionRange(0, 0);
            break;
          case 'end':
            $el.setSelectionRange(len, len);
            break;
          default:
            $el.setSelectionRange(0, len);
        }
      }
    },
    blur() {
      if (this.type === 'textarea') {
        this.$refs.textarea.blur();
      } else {
        this.$refs.input.blur();
      }
    },
    handleClear() {
      const e = { target: { value: '' } };
      this.$emit('update:modelValue', '');
      this.setCurrentValue('');
      this.$emit('on-change', e);
      this.$emit('on-clear');
    },
    handleSearch() {
      if (this.itemDisabled) return false;
      this.$refs.input.focus();
      this.$emit('on-search', this.currentValue);
    },
    handleToggleShowPassword() {
      if (this.itemDisabled) return false;
      this.showPassword = !this.showPassword;
      this.focus();
      const len = this.currentValue.length;
      setTimeout(() => {
        this.$refs.input.setSelectionRange(len, len);
      }, 0);
    },
    handleCalcIconOffset() {
      const $el = this.$el.querySelectorAll('.ivu-input-group-append')[0];
      if ($el) {
        this.clearableIconOffset = $el.offsetWidth;
      } else {
        this.clearableIconOffset = 0;
      }
    },
  },
  watch: {
    modelValue(val) {
      this.setCurrentValue(val);
    },
    type() {
      nextTick(this.handleCalcIconOffset);
    },
  },
  mounted() {
    this.slotReady = true;
    this.resizeTextarea();
    this.handleCalcIconOffset();
  },
  updated() {
    nextTick(this.handleCalcIconOffset);
  },
};
</script>
